xenotime composition

Composition of coexisting zircon and xenotime in rare …

Xenotime composition. Representative EMPA of xenotime are presented in Table 4. Microprobe analyses often reveal, analogous to zircon, low totals suggesting hydration of xenotime. The water content estimated from analytical data ranges from 1 to 11 wt. % H 2 O. The F content in xenotime is similar to that measured in zircon and …

Hydrothermal formation of heavy rare earth element (HREE)–xenotime …

Xenotime in the Browns Range has a very uniform chemical composition and is accompanied by hematite and minor light REE (LREE)-bearing florencite–goyazite (Cook et al., 2013). The breccias containing this ore ( Fig. 2A ) are associated with silicification and smectite–illite replacement of K-feldspar in the surrounding arkoses ( Morin-Ka et ...

The solubility of xenotime- (Y) and other HREE phosphates …

The rock composition (sample VNP130) was selected from Wall et al. (2008), and is for a rock in which an albite-bearing mineral assemblage was replaced by carbonates ± quartz ± apatite ± Fe oxides. Altered zircon crystals and hydrothermal xenotime-(Y) are present in the sample.

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Geochemical characterisation of xenotime formation …

Xenotime (YPO4) is a trace component in many metasedimentary and some igneous rocks, altered rocks and many hydrothermal ore assemblages, where it forms in response to a range of different processes from igneous crystallisation to low-temperature early diagenesis.Due to its wide range of formation temperatures, its suitability and …

Crystal chemistry and miscibility of chernovite-(Y), xenotime …

The A-site of the chernovite-(Y)–xenotime-(Y) series is characterised by a relatively constant composition, where Y is always the dominant cation (ranging from a maximum of 0.78 apfu to a minimum of 0.46 apfu), followed, on …

Monazite and xenotime petrochronologic constraints on …

Monazite and xenotime overgrowths and whole grains near garnet yielded 1424 ± 12 Ma and 1395 ± 15 Ma dates, respectively, and a temperature estimate of ~440 °C. The composition of these grains and their occurrence near resorbed garnet are consistent with growth during garnet breakdown (Williams et al., 2007, 2017; Hillenbrand …

Occurrence, Geology, Mineralogy, and Processing of Monazite, Xenotime …

Xenotime is a mineral that primarily contains YPO4, up to 60% in composition, with another 30% of the composition containing other heavy rare Earths [4][16]. Xenotime is a rare Earth

The chemical composition of xenotime form fissures and pegmatites …

The chemical composition of xenotime form fissures and pegmatites in the Alps Francesco Demartin; Francesco Demartin ... Xenotime-(Yb), YbPO 4, a new mineral species from the Shatford Lake pegmatite group, southeastern Manitoba, Canada The Canadian Mineralogist. A comparative study of some pegmatitic and fissure …

Xenotime: The mineral xenotime information and …

Composition: Xenotime Group: Phosphate, vanadate, or arsenate of yttrium, ytterbium, cerium, lanthanum, neodymium, or scandium

(PDF) Microprobe Monazite Geochronology: Understanding Geologic

Monazite and xenotime U-Th-Pb total dates and compositions were acquired with the Cameca SX-Ultrachron electron microprobe at the University of Massachusetts-Amherst (Hetherington et al., 2008;M ...

Xenotime-(Y) YPO4

Cell Data: Space Group: I41/amd. = 6.884–6.902. = 6.021–6.038. = 4. X-ray Powder Pattern: Synthetic. 3.443 (100), 2.558 (60), 1.762 (45), 4.54 (25), 2.145 (25), 1.820 (18), …

Xenotime-(Y) formation from zircon …

Xenotime-(Y) and monazite are common accessory phosphates that control the rare earth element (REE) budget in many rocks. Whereas monazite preferentially incorporates the light REE (LREE) from La to Gd, the xenotime incorporates the heavy REE (HREE) from Tb to Lu (Ni et al. 1995).For monazite, the REE patterns are steep …

Understanding geologic processes with xenotime: …

Xenotime is a tetragonal mineral (space group I 4 1 / amd) with a zircon-type structure. It is characterised by an ideal formula of AT O 4 where A represents …

Experimental metasomatism of monazite and xenotime: …

If monazite and xenotime can be altered by specific fluid compositions during metamorphism, evidence for the alteration as well as the nature of the alteration could provide information on the composition and physical nature of the fluids involved. Since monazite and xenotime are important geological repositories for P, Th, U, REE and Y,

Composition, lattice parameters, and room temperature

The composition, lattice parameters, and elastic constants of natural single crystal YPO 4 xenotime from Novo Horizonte (Brazil) were determined using EPMA, XRD, and the pulse-echo technique. The composition indicates a 24% substitution of Y sites with other rare-earth elements. The lattice parameters of the studied crystal deviated only …

Xenotime

The main characteristics of xenotime are listed below: (1) The content of yttrium is high while that of the light rare earths is low (Table 12 ). (2) The content of thorium is lower than that in monazite ( Table 13 ). (3) The composition of tungsten-containing xenotime is …

Xenotime-(Y) YPO4

Xenotime-(Y) YPO4 c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Tetragonal. Point Group: 4/m2/m2/m. ... C.M. Gramaccioli (1991) The chemical composition of xenotime from fissures and pegmatites in the Alps. Can. Mineral., 29, 69–75. (4) Y. Ni, J.M. Hughes, and A.N. Mariano (1995) Crystal

Multi-stage evolution of xenotime–(Y) from Písek

The magmatic xenotime underwent intense secondary alteration, from rims inwards, resulting in the formation of inclusion-rich well crystalline xenotime domains of near end-member composition. Two types of recrystallization were distinguished in relation to the type of inclusions: i) xenotime with coffinite-thorite, cheralite and monazite ...

In-situ U–Pb dating of monazite, xenotime, and zircon from …

After composition measurements, the sample mounts were gently polished to remove the carbon coating, and then Au-coated with reference materials that in a separate mount. The instrument configuration and operating procedures followed the established protocols for apatites and monazites ( Sano et al., 1999, Sano et al., 2006 ).

Xenotime-(Y) Mineral Data

Composition: Molecular Weight = 183.88 gm. Yttrium 48.35 % Y 61.40 % Y 2 O 3. Phosphorus 16.84 % P 38.60 % P 2 O 5. Oxygen 34.80 % O. ______ ______ 100.00 % …

TABLE 1 . Chemical composition of xenotime …

The composition of xenotime in relation to the bulk-rock concentrations of the lantha- nides and actinides (e.g., Table 1), and the relative pro- portions among them, are explored in this section. ...

Monazite and xenotime U–Th–Pb

Monazite and xenotime are the two most useful and commonly used geochronometers for deciphering ages from metamorphic rocks. The low analytical cost involved in electron probe micro-analyser chemical dating, ease of sample preparation and abundance in metamorphic rocks of wide P–T conditions make monazite and xenotime …

X-ray-excited optical luminescence imaging for on-site identification

However, high‑uranium xenotime (e.g., 5.5 wt%), is uncommon as approximately half of the xenotime in the world has uranium concentrations of less than 1.1 wt%. Therefore, on-site and field analysis using XEOL imaging could be applied as a first-pass technique to quickly identify xenotime at REE deposits or during exploration …

Experimental metasomatism of monazite and xenotime: …

Monazite and xenotime composition, stability, reactivity and growth in metamorphic systems: the role of fluid composition. Monazite and xenotime compositions, like those of many minerals, will reflect the intensive and extensive properties of a rock. Factors known to be of significance include rock chemistry and composition, ...

Xenotime-(Yb) Mineral Data

Forms a series with xenotime-(Y). IMA Status: Approved IMA 1999 (Dana # Added) Locality: Shatford Lake pegmatite group, near the margin of the Lac du Bonnet batholith, southeastern Manitoba. Link to MinDat Location Data. Name Origin: Named after its composition and relationship with xenotime-(Y). Name Pronunciation: Xenotime-(Yb) …

Composition and origin of intermediate solid solutions in …

The composition of these minerals indicates that the alteration species of the intermediate thorite–xenotime–zircon solid solution largely inherited the complex chemistry of their parents. Thorite-bearing granites from Jordan display a widespread decomposition of allanite and monazite into REE fluorocarbonates.

Paragenesis and composition of xenotime-(Y) and

The high U content of xenotime-(Y) and composition of early florencite-(Ce) potentially support a genetic association between the HREE mineralization and the coeval unconformity-related U deposits ...

LA-ICP-MS and TEM constraints on the magmatic and post …

The altered xenotime is patchy zoned at the microscale and shows a greater extent of microporosity closer to the neighbouring zircon, but bears a homogeneous crystallinity and composition regarding nanoscale observations of foils in domains of lower porosity further away from the zircon.

The chemical composition of REE-Y-Th-U-rich accessory …

Sm. In xenotime-bearing peraluminous granites, the frac-* E-mail: [email protected] tions of Y and total HREE contained in xenotime vary from;30–50% (Bea 1996a). Xenotime rarely has been studied intensively in con-trast to apatite, zircon, and monazite, on which a consid-erable amount of experimental and analytical work has